Steel pipe here for pressure applications is typically A53 welded (or sometimes seamless) or A106 seamless. I do know what centrifugally cast iron pipe is, and it is still used in drainage applications, but it is NOT joined by threading. I've never heard of "black iron pipe" before, and suspect that it is a misuse of the "black iron" description of non-galvanized black malleable iron fittings, misapplied to the pipe which is STEEL I am unaware of an ASTM designation for anything called "black iron pipe". That link that John R Baker posted is very confusing. These fittings are also made in cast stainless steels such as CF8 (304) and CF8M (316).ģ000# threaded fittings are generally A105 carbon steel forgings, not castings.ģ00# malleable iron fittings do exist, and just to make confusion more likely, they have dimensions very similar to 3000# forged steel fittings. If you find a 150# threaded fitting which sticks to a magnet, it is almost certain to be malleable iron, whether it is galvanized or black (not galvanized). Iron steel pipes corrode easily in water, and minerals in the pipe can dissolve in the water and clog the pipe as well.Gray cast iron threaded fittings in small sizes (1/2-2") are no longer available, or if they are, they're rare enough that I've never seen one in the ~ 25 yrs I've been dealing with fittings on a daily basis. On the other hand, malleable cast iron steel pipe is not suitable for water transport. With this in mind, transporting natural gas in galvanized pipe is dangerous, so it is often used to carry water. Galvanized pipe has a zinc surface, so over time, minerals can flake off and clog the pipe. Black steel pipe has no coating and no steam is used in the manufacturing process, so it is widely used to deliver gases such as propane and natural gas to residential and commercial buildings. The main difference between Carbon Steel Pipe Fittings and galvanized pipe is its surface. ![]() It is called black iron pipe because of its dark surface color, which is formed from iron oxide during the manufacturing process. Carbon steel fittings are also most often used in fire sprinkler systems because of their high heat resistance black malleable iron fittings are also used in water supply piping because of their resistance to water damage. Carbon steel fittings are used in residential applications to transport natural gas and propane gas.Ĭarbon steel fittings are manufactured as Seamless Steel Pipe, which makes it a better type for natural gas transportation and fire sprinkler systems because it provides better protection against fire than galvanized pipe. Galvanized fittings should not be used for gas applications.īlack malleable cast iron fittings are used to make connections to carbon steel fittings. The main advantage of using galvanized fittings is that they offer superior rust resistance compared to black and carbon steel fittings. While they work best in cold water piping, they can also be used for hot water. Galvanized pipe and fittings can be used in most applications, with the exception of underground pipelines. ![]() Galvanized pipe fittings are used in a myriad of outdoor and industrial applications because of the material's ability to resist corrosion and salt. Galvanized pipe is primarily used to supply water to homes and commercial buildings it is also used as scaffold framing due to its rust protection. Galvanized fittings are covered with a layer of zinc, which makes these fittings more resistant to corrosion and helps prevent the accumulation of mineral deposits that can clog pipes. For transportation, black malleable iron fittings are more susceptible to erosion than galvanized pipe, making it more suitable for transporting gases, while galvanized pipe is suitable for transporting water rather than gases. As a result, galvanized pipe is more durable. Both black malleable iron fittings and galvanized pipe are made of steel however, galvanized pipe has a zinc coating, while black pipe does not. Black Malleable Iron Pipe Fittings and galvanized steel pipe fittings are the two most common types of pipe used to transport liquids and gases.
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